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| El Tor | |
|---|---|
| Name | El Tor |
| Domain | Bacteria |
| Phylum | Proteobacteria |
| Classis | Gammaproteobacteria |
| Ordo | Vibrionales |
| Familia | Vibrionaceae |
| Genus | Vibrio |
| Species | cholerae |
| Biotype | El Tor |
El Tor is a biotype of Vibrio cholerae responsible for pandemic and epidemic cholera waves during the 20th and 21st centuries. First distinguished in the early 20th century, the El Tor biotype replaced previous classical biotypes in many regions and influenced public health responses across Egypt, India, Indonesia, Bangladesh, and Yemen. The biotype is notable for differences in environmental persistence, virulence factor profiles, and phage susceptibility compared with the classical biotype described during earlier pandemics.
Isolated originally from a quarantine camp at El-Tor, Sinai during an outbreak affecting pilgrims returning from Mecca in 1905, the El Tor biotype was characterized during field investigations involving researchers from Egyptian Public Health Service and European laboratories such as the Pasteur Institute. Subsequent decades saw El Tor strains implicated in the seventh cholera pandemic beginning in 1961, which spread from Sulawesi and Indonesia through South Asia, reaching Turkey, Soviet Union, Africa, and the Americas by the 1970s. Epidemiological linkage was established by investigators working at institutions including the World Health Organization, Centers for Disease Control and Prevention, and national public health laboratories in India and Bangladesh, prompting revisions to control efforts after comparisons with the classical strains studied by teams from the Liverpool School of Tropical Medicine and the Rockefeller Foundation.
El Tor belongs to the species Vibrio cholerae and is biochemically and genetically distinct from the classical biotype that caused earlier pandemics described by investigators at the London School of Hygiene & Tropical Medicine. El Tor commonly carries the CTXφ prophage encoding cholera toxin genes ctxA and ctxB, as characterized by molecular laboratories at the Pasteur Institute and Johns Hopkins Bloomberg School of Public Health. Phenotypic traits include hemolysin production observed in assays standardized at the Centers for Disease Control and Prevention and growth behavior reported in culture collections such as the American Type Culture Collection. Genomic sequencing efforts by consortia involving Wellcome Sanger Institute, National Institutes of Health, and regional sequencing centers have revealed genomic islands, integrative conjugative elements related to antibiotic resistance described in publications from Harvard Medical School and University of Oxford, and sequence variation in the O1 and O139 serogroup determinants first noted in surveillance by the International Centre for Diarrhoeal Disease Research, Bangladesh.
El Tor drove the seventh pandemic, with documented spread traced through shipping and human mobility patterns connecting Indonesia, India, Pakistan, Bangladesh, Iran, Iraq, Egypt, and later Haiti and the Dominican Republic. Outbreak investigations conducted by teams from the World Health Organization, Médecins Sans Frontières, and national ministries of health highlighted the role of environmental reservoirs such as estuaries studied in projects at Scripps Institution of Oceanography and the Bangladesh Inland Water Transport Authority. Molecular epidemiology using multilocus sequence typing by laboratories at Pasteur Institute and Wellcome Sanger Institute linked isolates across continents, while public health reports from the Pan American Health Organization documented introductions into the Americas. Notable serogroup shifts, including emergence of Vibrio cholerae O139 in the 1990s described by groups at All India Institute of Medical Sciences, altered regional epidemiology and immunological landscapes.
El Tor infection manifests with profuse watery diarrhea and vomiting leading to rapid dehydration documented in clinical series from Dhaka Hospital of the International Centre for Diarrhoeal Disease Research, Bangladesh and emergency departments at Aga Khan University Hospital. Pathogenesis involves cholera toxin encoded by CTXφ, which ADP-ribosylates Gsα as elucidated in mechanistic studies at Yale School of Medicine and University of California, San Francisco. El Tor isolates show variation in toxin-coregulated pilus genes described in molecular studies at Stanford University School of Medicine and in accessory virulence factors characterized by researchers at University of Maryland. Clinically, El Tor infections have been associated with a wider spectrum ranging from asymptomatic carriage documented in field studies by World Health Organization teams to severe cholera requiring aggressive fluid resuscitation protocols developed at International Centre for Diarrhoeal Disease Research, Bangladesh.
Laboratory identification follows microbiological methods standardized by the World Health Organization and national reference labs such as the Centers for Disease Control and Prevention, including culture on selective media described in manuals from the Public Health England and biochemical testing protocols used at the National Institute of Virology, India. Molecular diagnostics employ PCR assays targeting ctxA, tcpA, and rfb genes developed by groups at Johns Hopkins Bloomberg School of Public Health and the Pasteur Institute. Phage-typing schemes historically from the Central Public Health Laboratory and pulsed-field gel electrophoresis profiles in studies at the Wellcome Sanger Institute have aided outbreak attribution. Rapid immunochromatographic tests validated by the International Centre for Diarrhoeal Disease Research, Bangladesh provide point-of-care options in field settings.
Treatment centers on prompt rehydration with oral rehydration solution protocols pioneered at the International Centre for Diarrhoeal Disease Research, Bangladesh and intravenous therapy guided by clinical guidelines from the World Health Organization and the Centers for Disease Control and Prevention. Antibiotic regimens informed by susceptibility data from laboratories at All India Institute of Medical Sciences and the National Institutes of Health include doxycycline, azithromycin, and ciprofloxacin where appropriate. Prevention relies on interventions promoted by the World Health Organization, UNICEF, and Médecins Sans Frontières: safe water provision through projects by UNICEF Water, Sanitation and Hygiene, sanitation improvements supported by World Bank infrastructure loans, and oral cholera vaccines such as those prequalified by the World Health Organization and manufactured by producers like Shantha Biotechnics and Sanofi Pasteur.
El Tor shaped modern cholera control policy, influencing global surveillance coordinated by the World Health Organization and outbreak response protocols implemented by Médecins Sans Frontières, national ministries, and regional bodies like the Pan American Health Organization. Vaccine stockpiles managed by the International Coordinating Group and risk mapping by the Global Task Force on Cholera Control support targeted interventions. Environmental monitoring programs led by institutions such as Scripps Institution of Oceanography and the International Centre for Diarrhoeal Disease Research, Bangladesh inform seasonal preparedness, while integrated response models developed by Centers for Disease Control and Prevention and Harvard T.H. Chan School of Public Health aim to reduce transmission and mortality in vulnerable settings.